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Finding the Fourth Proportional to 69,319.41, 103,979.13 and 19,406.86

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Solution

The fourth proportional to 69,319.41, 103,979.13 and 19,406.86 is: 29,110.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,319.41 : 103,979.13 = 19,406.86 : x
  2. Step 2: Convert to fraction form
    69,319.41/103,979.13 = 19,406.86/x
  3. Step 3: Cross multiply
    69,319.41x = 103,979.13 × 19,406.86
  4. Step 4: Simplify right side
    69,319.41x = 2,017,908,542.29
  5. Step 5: Solve for x
    x = 2,017,908,542.29/69,319.41
  6. Step 6: Final answer
    x = 29,110.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.